Caulking gun



W. WALLACE Dec. 18, 1951 CAULKING GUN Filed Oct. 17, 1947 Q i ll. E

. INVENTOR. W/LL/AM WALL/10E BY a ,&0//0 ($.22?

ATTOlQ/YEYS Patented Dec. 18, 1951 UNITED STATES eATENr OFFICE 2 Claims.

The present invention relates to a caulking gun for injecting caulking material into crevices in the walls of buildings and the like.

An object of the invention is to provide a caulking gun which is inexpensive to manufacture and which is provided with a nozzle which may be readily removed for refilling the gun.

Another object of the invention is to provide a caulking gun which can quickly be filled or emptied into a bulk container of caulking compound.

Other objects and advantages of the invention will be apparent from the following description of a preferred form of the invention, reference being made to the accompanying drawings wherein:

Fig. 1 is a view in elevation of a caulking gun, parts thereof being broken away to show the construction thereof;

Fig. 2 is a view in section taken on line 2--2 of Fig. 1; and

Fig. 3 is a view in elevation of a nozzle for the gun.

Referring to the drawings, the caulking gun comprises a cylindrical barrel Ill which is preferably formed of a plastic material, which plastic material may be of a transparent acrylic type. One end of the barrel is closed by a plug I I which has a counterbored face for receiving the end of the barrel l and the plug is cemented or otherwise secured to the end portion of the barrel. The central portion of the plug II is bored for receiving a plunger stem I3 which projects into the barrel It and which has a plunger I4 attached to the end within the barrel. The opposite end of the stem I3 is provided with a suitable handle I5 attached thereto by a nut I5 threaded to the end of the stem.

The plunger [4 preferably consists of two rigid metal disks l8 having a leather washer I9 interposed therebetween. The plunger is firmly attached to the stem by nuts and 20' which are threaded to the lower end of the stem so that when the stem I3 is reciprocated the plunger will be capable of drawing caulking compound into the barrel on one stroke and expelling it on the opposite stroke. In order to provide for breathing of the barrel when the plunger is operated an opening 23 is formed in the side thereof adjacent the plug I I.

The lower end of the barrel I0 is adapted to receive a nozzle 2! thereof, which nozzle is preferably formed of metal having a tapered end 22 with a relatively small opening at the end thereof, preferably cut at an angle to the longitudinal axis of the nozzle, for depositing the caulking material into a crevice when the edges of the opening are pressed against the surfaces adjacent the crevice and tilting the gun at an angle as indicated in the drawing.

The nozzle 2| is adapted to be attached to the barrel I6 solely by friction and for this purpose the end of the nozzle having the wide diameter is tapered as indicated at a in Fig. 3. The taper is such that the nozzle 2I can be pressed on over the end portion of the barrel so that the barrel will tend to be compressed and its resiliency will frictionally hold the nozzle thereto. I have found that by pressing the nozzle to the barrel and then applying a twist to the barrel and nozzle a tight fit is effected which will hold the nozzle in place in spite of the outward pressure exerted by the flow of the caulking material through the nozzle. To remove the nozzle it is merely necessary to twist the same relative to the barrel and at the same time pull the nozzle from the barrel. By this structure the nozzle can be firmly attached to the barrel without the provision of locking means, such as threads or bayonet and slot locking structures. This materially reduces the cost of manufacture and at the same time provides faultless performance.

In using the gun the nozzle ZI is removed and the lower end of the barrel II] is inserted into a bulk container of caulking material with the plunger adjacent the open end. The plunger is then drawn upwardly which causes the caulking material to be sucked into the barrel and then the nozzle is placed on the barrel as described so that the gun can then be used to direct caulking material into the crevices that are desired to be filled. Of course, the caulking material is expelled when the plunger is forced downwardly. The gun may be quickly emptied by removing the nozzle 2| and operating the plunger to discharge the material from the open end of the barrel into the bulk container for the caulking material.

Thus, by my invention I have provided an exceedingly simple and inexpensive caulking gun which is extremely easy to operate and which may be filled and emptied into a storage container of caulking material.

Although I have shown but one form of the invention, it is to be understood that other forms might be adopted, all falling within the scope of the claims which follow.

I claim:

1. A caulking gun comprising, a tubular barrel 3 of substantially constant diameter; a manually operated plunger reciprocable in the barrel for drawing in and forcing out caulking compound from one end of the barrel; and a nozzle member having one end adapted to slidingly receive a portion of the barrel at said end, the inside diameter of said nozzle member being gradually reduced commencing at a point inwardly from said one end thereof whereby the nozzle may be secured on said barrel solely by friction between the outer end surface of the barrel and the tapered inner wall of the nozzle.

2. A caulking gun of the type defined in claim 1 in which the barrel is formed of rigid transparent plastic material.

WILLIAM WALLACE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 493,616 Clark Mar. 14, 1893 660,952 Hall Oct. 30, 1900 796,246 Printz Aug. 1, 1905 1,604,786 Rinaldi Oct. 26, 1926 2,115,591 Sherbondy Apr. 26, 1938 2,184,612 Eaton Dec. 26, 1939 

